<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>Retrieves a node specified by index</title>
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-base.css" />
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-medium.css" />

 </head>
 <body class="docs"><div class="navbar navbar-fixed-top">
  <div class="navbar-inner clearfix">
    <ul class="nav" style="width: 100%">
      <li style="float: left;"><a href="domnodelist.count.html">« DOMNodeList::count</a></li>
      <li style="float: right;"><a href="class.domnotation.html">DOMNotation »</a></li>
    </ul>
  </div>
</div>
<div id="breadcrumbs" class="clearfix">
  <ul class="breadcrumbs-container">
    <li><a href="index.html">PHP Manual</a></li>
    <li><a href="class.domnodelist.html">DOMNodeList</a></li>
    <li>Retrieves a node specified by index</li>
  </ul>
</div>
<div id="layout">
  <div id="layout-content"><div id="domnodelist.item" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">DOMNodeList::item</h1>
  <p class="verinfo">(PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">DOMNodeList::item</span> &mdash; <span class="dc-title">
   Retrieves a node specified by index
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-domnodelist.item-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>DOMNodeList::item</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$index</code></span>): <span class="type"><span class="type"><a href="class.domnode.html" class="type DOMNode">DOMNode</a></span>|<span class="type"><span class="type DOMNameSpaceNode">DOMNameSpaceNode</span></span>|<span class="type">null</span></span></div>

  <p class="para rdfs-comment">
   Retrieves a node specified by <code class="parameter">index</code> within the 
   <span class="classname"><a href="class.domnodelist.html" class="classname">DOMNodeList</a></span> object.
  </p>
  <div class="tip"><strong class="tip">小技巧</strong>
   <p class="para">
    If you need to know the number of nodes in the collection, use 
    the <code class="literal">length</code> property of the 
    <span class="classname"><a href="class.domnodelist.html" class="classname">DOMNodeList</a></span> object.
   </p>
  </div>
 </div>

 <div class="refsect1 parameters" id="refsect1-domnodelist.item-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">index</code></dt>

     <dd>

      <p class="para">
       Index of the node into the collection.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-domnodelist.item-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   The node at the <code class="parameter">index</code>th position in the 
   <span class="classname"><a href="class.domnodelist.html" class="classname">DOMNodeList</a></span>, or <strong><code>null</code></strong> if that is not a valid
   index.
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-domnodelist.item-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5424">
    <p><strong>示例 #1 Traversing all the entries of the table</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$doc&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">DOMDocument</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$doc</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">load</span><span style="color: #007700">(</span><span style="color: #DD0000">'book.xml'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$items&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$doc</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getElementsByTagName</span><span style="color: #007700">(</span><span style="color: #DD0000">'entry'</span><span style="color: #007700">);<br /><br />for&nbsp;(</span><span style="color: #0000BB">$i&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">;&nbsp;</span><span style="color: #0000BB">$i&nbsp;</span><span style="color: #007700">&lt;&nbsp;</span><span style="color: #0000BB">$items</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">length</span><span style="color: #007700">;&nbsp;</span><span style="color: #0000BB">$i</span><span style="color: #007700">++)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$items</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">item</span><span style="color: #007700">(</span><span style="color: #0000BB">$i</span><span style="color: #007700">)-&gt;</span><span style="color: #0000BB">nodeValue&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>
     Alternatively, you can use <a href="control-structures.foreach.html" class="link">foreach</a>, which is a much more convenient way:
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$items&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$item</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$item</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">nodeValue&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Title
Author
Language
ISBN
The Grapes of Wrath
John Steinbeck
en
0140186409
The Pearl
John Steinbeck
en
014017737X
Samarcande
Amine Maalouf
fr
2253051209
</pre></div>
    </div>
   </div>
  </p>
 </div>

</div></div></div></body></html>